2 of 8 pics were good, but the other ones came out very badly. So i wrote to the seller and asked, if the film was stored correctly. I asked if the film was damaged. They answered, that the pressure rollers do not work correctly, so the picture could not develop correctly. The chemical elements of the film could not spread constantly so the pic came out blank.

Is there anybody who knows something about the pressure rolls? Is it possible to change or repair them? Or is that the dead of my camera?

Define "very badly". If you have bad roller pressure, you'll have goldish-brown areas on at least a third of your image or so. If you're getting completely washed-out (white) images: more than likely you're not shielding the image from light when it ejects. Impossible's color film still has this issue, black and white "Gen-2" doesn't.

hello it's my first time hear so lease be patient.I've just bought a Polaroid 636. I also bought a film with expired date April 2016 and when i shoot pics this what have after 3 hours of development. https://naforum.zapodaj.net/89c11269dca6.jpg.htmlcould please help solve this case. Were the chemicals on film to old (sotrage in cold conditions) or it's a problem with camera?